Tire alarm



March 20, 1928.

l.. GARRETT TIRE ALARM Filed April 2l. 1926 atto: "eq

nnx W2 .5, $515 '55551554311 van. wall. 74.14144,

Patented ,Man 2Q, 19.28.

Y Latinas' LEE G'ananrr, or Bomann, rms. f

, 'rma Anania.

. Appuuon tutti pgn 2 1, i926. serial N0. 103,523. l

The present invention has for its purpose to provide an .alarm for use on inflating .valve lcasings fQlhdnoting when the tired' f the inflatlllg valve and retains the sameOpCIl needs inflation.

Flat tires are caused from punctures or slow leaks, and,` in o rderto denote when the tire needsination, the present construction of alarm Includes-means to be setto sound the alarm at different pressures oair in the sound at any desired -pounds pressurein the'v tire, for instance, ten, fifteen, twenty orH twenty-five pounds. When the tire deflates due to puncture and particularly due to valve, opens at ten, fifteen, twenty or twentylive pounds pressure, depending von its ad.

justmenh allowing `the escape of air toV sound the alarm; rIhe pressure of air above 4any vone of these amounts4 ofpressure of air in the tire or other pressure, it dependingV on the adjustment of the valve, retains the valve closed.v

v A. further purpose isto provide means pn the interior 4of the casing of the alarm de.-

. vice to hold ltheinflating valve open, the desired amount ofv pounds pressure 1n the tire acting to retain the tensioned valve of the alarm closed until the pressure reduces to theamountat. which the tensioned valve of the alarm is set to open.

rlhe invention comprises further features and combinations of parts to be hereinafter4 set forth, shown in the drawings and claimed.

In the drawings: v

i Figurel is a view inside elevation of a portion of an automobile wheel with its tire applied, illustrating'the improvedlalarm as applied.

' Figure 2 is-a sectional view through the alarm still showing it applied to the inflating valve casing, withvthe inflating valve open and thevalve of the alarm device closed due to the desired pressure in the tire.

Figure 3 is a View similar to Figure 2, but showing the valvev of the alarm device open, it being understood that the alarm is being) given as 'to the tire requiring" inflation.

Referring to the drawings, 1 designatesla casing of the wheel and 2 denotes the casing of tire of a device. y.The cas1ng2 has an 1nthe alarm 'opening position.

outer end has an additional wall 13 provided teriordisk wall 3 provided with a central extension 4'wh1ch is hollow, as indicated at 5. This extension 4 bears upon the stem of as long as the casing 2 is thr'eadingly connected `at 6 tothe inlating 'valve casing.

a'nnularcushion or packing ring 7 is suitably retained in the casing 2 adjacent the disk wall 3 and thecylindrical wall of vthe casing 2 to bear'upon the marginal edge of theinflating valve casing to insure a tight vlit. The disk wall 3 is provided with a plu- V rality of openings or perforations 8 which permit the escape of fair from the tire, the

air to act upon a valve to hold it closed as long as vthe desired pressure of air remains in the tire; l

lThe casing 2 has a disk wall'or partition 9 provided v4with a valve seat 1 0 with which a' valve 11 cooperates.

The valve 11 constitutes an element of the alarm and is carried by a stem 12. One end of the stem 12 is guided in the hollow 'o' the extension 4 whllethe bottom of the hollow 5 cooperates with the stem to limit the valve 11 in -its The casing 2 near its to an amount below the amount at which the lvalve is set to open. As long as the pressure of air in the tire is in excess of the amount at which the valve 11 is set to open, the valve 11'is retained closed due to-the pressure of air inthe tire. The adjusting screw 16 has a kerf or slot to receive the end of a screw-driver or similar .tool for adjusting the screw for the purposeof regulating the'tension 'of the spring 18 in order to permit thetension of the spring to open the valve 11 when the pressure of air increases to the amount at which the valvelll has been adjusted to open.v

The casing 2 at its outer end-is'exteriorly ythreaded and is engaged by a' whistling reed screw 16 is adjusted so that the valve 11 will open at ten, fifteen, twenty or twentyfive pounds 'or at any amount as may be desired, and then the tire is inflated to the desired amount of' pressure say, for instance, fifty, fifty-five or sixty pounds. The alarm is then threaded' on the inflating valve casing land should the tire deflate, due to slow leaks or dueto a puncture, until the pressure in the tire reduces to the amount at which the spring 18 is tensioned to permit the valve -11 toyopen, then the lower pressure of air from the tire escapes and passes through the openings or apertures 8 and through the valve seat and then through the opening 15 and escape by way of the openings in the whistling reed, thereby vcreating a. shrill whistle and indicating. to the chauffer or y owner of the automobile that the tire needs I inflating.

The inventionhavingbeen described, whatv a partition disk wall disposed adjacent the first disk Wall and provided With a Valve opening, a screw threadingly engaged with the second disk wall in axial alignment with the casing, said screw being provided with an axial bore, a valve engaging the valve seat of the artition `disk wall and having a stem slidaiily engaged in the bores of the extension and the screw, a compression spring in surrounding relation to the stem and compressed between the Valve and the extremity of the screw, said spaced disk walls having perforations, and a Whistle carried by the casing at its outer end.

In testimony whereof he aifiXes his signature.

j LEE GARRETT. 

